Paleocene and Eocene were very warm, due to only tropical-like Antarctica findings? 35-65 myr ago, Antarctica would still be at south pole. And one would have a long night of 4-5 months; so not entirely like our tropics. Has the literature assumed that the entire planet is very warm? Drake's passage was closed, and Panama isthmus was probably open. Nothing is known about paleo-oceanic currents. Was a warm current perhaps wrapped around Antarctica; hence only regional warming?